Well in my opinion, if your child is seriously into sport, then there is no reason why they cannot do that as long as the Endo is prepared to keep checking their levels.  In theory there is more call for cortisol when one expends more energy and puts your body under more stress, physical or mental.  If you had a child do sport for years and have good levels and then suddenyl stop due to injury forinstance, you may see a slowing in growth there as of course your cortisol dose has obviosuly been adjusted to that childs particular activity levels.  At the opposite extreme, if you have a child that isn’t remotely interested in sport for a time, whom takes it up a little later, his levels need to be monitored too and med’s adjusted accordingly.  I think atheletes actually practise a little more than three times per week for an hour.  Some marathon runners practise almost daily and run for hours on end.  You will only take one look at their physique’s and notice they are lean and very long.  This is the increase in cortisol in their bodies.  As cortisol causes catabolism after some time, because they run for hours without replacing the lost glycogen quite to the extent that they should, the body uses muscle tissue for energy instead.  In other words canabolizes the tissue to get glycogen.  In contrast people who move much more slowly and just do something like weight training and have a weight training diet build muscle and therefore you’ll note they look very bulked out.  If you asked them to run a mile they would probably not really manage it unless they had conditioned themselves with the cardio type of exposure that a marathon runner does. 

Someone like a footballer who is used to doing the odd sprint may develop a nice physique which is not quite as lithe as a marathon runner or not as bulky as a weight trainer because they are only exposed to short bursts of activity and it isn’t as long as a marathon runner.  I would not mind Ashley participating in short sprints or football and such as it is a short burst of activity and we can cater for this.  Long marathon type runs would or may cause a problem though, unless you drove at the side and plied them with drinks and some extra med’s.  They unfortunately don’t have the capacity to replace the stuff that is needed to expend so much energy for so long in sharp contrast to athletes whose cortiso,l levels have been shown to be very very elevated for days after even such an event.  This is why they never look thick and bulky.  A CAH’er would of course not make cortisol but have elevated anabolics instead, unless of course you were to double and triple their med’s for a few days.  Obviously that is why the body is meant to do and that is technically what we should mimick if you want to have your child be active in my opinion.